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Area Forecast Discussion (AFD)

Issued by Eureka, CA (EKA)

FXUS66 KEKA 232245

National Weather Service Eureka CA
245 PM PST Wed Jan 23 2019

.SYNOPSIS...Light rain will taper off across portions of Del Norte 
County this evening. Otherwise, mild and dry conditions are expected 
to prevail across the region through early next week.


.DISCUSSION...A weak upper level disturbance moving through the top 
of the NE Pacific ridge has been sufficient to generate a few 
sprinkles over Del Norte County today, however the primary impact 
for most of the area has been an increase in cloud cover helping 
to hold afternoon high temperatures down in the low to mid 50s. 
The exception has been farther south into Mendocino County where 
sunnier skies and slightly warmer temperatures prevail. Any light 
rain will quickly come to an end this evening as the upper wave 
drops south through the area. The ridge will then continue to 
amplify during the end of the work week as the ridge axis nudges 
eastward to the coast, promoting mostly clear skies and slightly 
warmer daytime temperatures heading into the weekend. The 
combination of clear skies and large scale subsidence will 
continue to support potential fog formation in the typically 
favored areas for the next several nights. A potent shortwave 
trough progged to dig southward across the intermountain west 
early next week will bring more robust offshore flow and colder 
temperatures aloft to the area, however sensible weather impacts 
look to be negligible as high pressure continues to dominate the 
NE Pacific and west coast for the foreseeable future. /CB 


.AVIATION...MVFR ceilings have spread into ACV and CEC as a weak 
storm system arrives from the northwest. Some light drizzle will be 
possible late this afternoon and evening at both sites, with some 
improvement in ceilings and visibility expected after midnight, 
followed by VFR conditions during the day Thursday.

At UKI, some patchy shallow fog will be possible overnight tonight, 
but any that manages to develop should dissipate by late morning. 
Confidence is low regarding this. /BRC


.MARINE...Very little change is expected through the end of the week 
as the waters will remain within a regime of moderate to fresh 
northerlies. As is often the case in northerly flow regimes, the 
strongest winds are expected to occur from Cape Mendocino 
southwards, where winds of between 15 and 25 kt are expected to 
generate some moderately steep seas. Otherwise, ocean conditions 
will generally remain dominated by a series of long period westerly 
swells, the first of which will continue to build through the 
evening today. While small in comparison to some of the larger 
swells we've seen this season, these swells will likely bring 
significant wave heights to near and even slightly above 10 feet, 
and while seas have not quite reached these heights as of 2 PM 
Wednesday, small craft advisories will be allowed to continue 
given the expected upward trend later today. 

Winds are expected to weaken later in the weekend and early next 
week, and eventually turn primarily offshore/easterly. Meanwhile, 
moderate westerly swells will continue to move through the 
waters. /BRC


.BEACH HAZARDS...A series of moderate long period westerly 
swells will impact area beaches this week, which may result in an 
elevated risk of sneaker waves at various times. Beachgoers are 
urged to use caution on area beaches, and maintain a safe distance 
from the surf line at all times. /BRC


 3 AM PST Thursday for PZZ450-470.

     Small Craft Advisory until 9 PM PST Thursday for PZZ455.

     Small Craft Advisory until 3 PM PST Friday for PZZ475.



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